Prosecutors confirmed again Friday that they have a suspect in the case of slain Essex couple, Bill and Lorraine Currier.

They've said he or she is in custody in another state for unrelated crimes. Officials still won't reveal any other information about the murderer, but recently filed court documents give the public a glimpse of what he or she did.

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When investigators started digging at the site of an old farmhouse in Essex last April, they wouldn't say why. All they would say was it was related to the Curriers.

Now, new documents show police weren't just looking for evidence -- they were looking for bodies.

Lt. George Murtie of the Essex police department writes the Curriers "were reported to have died by homicidal violence during the early morning hours of June 9, 2011, at this abandoned farmhouse."

Investigators said they did not find the Curriers at the site, but Murtie's new affidavit states there were "indications of human decomposition" found in the farmhouse basement.

Since the farmhouse where the killings took place was demolished a few months afterward, investigators continued their search in a Coventry landfill.

Police and FBI combed through it, but that too, at this time, appears to have turned up nothing.

The case however, is far from being a cold one.

"Frankly, the public doesn't know a lot. That's by, I think, a deliberate decision right now," said state's attorney T.J. Donovan.

He added that the investigation is ongoing and when pressed about the release of further details, promised that someday they would come.

"When it comes out, the public will understand. It's a difficult thing, but law enforcement officials, not only state officials, but federal officials, are cognizant of that fact and we're working hard on this case," said Donovan.

The final page of the latest affidavit confirms what investigators told the media in July -- police have "no doubt" that William and Lorraine Currier are dead.

Earlier this month, a judge ruled that death certificates for the Curriers could be issued.